I carry the All-Weather Journal No. 391-M(it's about 1/2 way down that page). It is really thin and only About 3-1/4 x 4-5/8 inches which can be trimmed down if need be. I haven't needed to trim it more than that yet. Another bonus isthey are less than 2 bucks each and all-weather!
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If people concentrated on the really important things in life... there'd be a shortage of kid's fishing poles.